She said she would leave her house on a three-day family trip, so she had sex with her friend for three days (tentative)

Satori is my girlfriend, and her friend, who often hangs out. Satori is a quirky girl, and she suddenly thought she'd come to our house and was sleeping around there without her permission, and she didn't really know what she was thinking. One weekend, she was going on a family trip, so we didn't meet for three days. Just the day she left, Satori and I both cheated on her, and no one invited her to her. After that, we spent many times having sex, trying to get back what we couldn't do. We had almost all sex except for eating and sleeping. The time between them passed in a flash, and the day she was leaving was approaching.